About the Percentage Calculator
Our free online percentage calculator provides instant results for all your percentage calculations. Whether you're calculating discounts, tips, tax, or percentage changes, this calculator offers a simple and intuitive interface for quick and accurate computations.
Percentage Calculation Types
Calculate what percentage one number is of another. Perfect for finding discounts, commissions, or portions of a total.
Example: What is 25% of 200? Answer: 50
Calculate the percentage increase or decrease between two numbers. Essential for tracking growth, inflation, or performance changes.
Example: From 100 to 150 is a 50% increase
Find what percentage a smaller number is of a larger number. Useful for calculating grades, market share, or completion rates.
Example: 25 is 50% of 50
How to Use the Percentage Calculator
- Select the type of percentage calculation you need using the tabs
- Enter your values in the input fields
- Results are calculated automatically as you type
- Switch between calculation types using the tab menu
- Use the examples as reference for common calculations
Common Use Cases
Calculate sale prices, discount amounts, and final costs after percentage discounts. Perfect for comparing deals and finding the best value.
Calculate interest rates, investment returns, tax amounts, and percentage changes in your financial portfolio or budget.
Determine grade percentages, score improvements, and academic performance metrics. Essential for students and educators.
Analyze profit margins, growth rates, market share changes, and performance indicators for business decision-making.
Percentage Formulas and Examples
Formula: (Value × Percentage) ÷ 100
Example: 20% of 150 = (150 × 20) ÷ 100 = 30
Formula: ((New - Original) ÷ Original) × 100
Example: From 80 to 100 = ((100-80)÷80)×100 = 25%
Formula: (Part ÷ Total) × 100
Example: 15 of 60 = (15÷60)×100 = 25%
Formula: Value × (1 + Percentage/100)
Example: 200 increased by 10% = 200 × 1.10 = 220
Tips for Accurate Percentage Calculations
- Always double-check your input values for accuracy
- Remember that percentages are always out of 100
- For percentage changes, identify which value is the original/base amount
- Use the automatic calculation feature to see results in real-time
- Convert percentages to decimals for complex calculations (e.g., 25% = 0.25)
- When calculating tips, calculate the percentage of the pre-tax amount
- For consecutive percentage changes, calculate them separately